Four types of biomass (chicken waste, wood pellets, coffee residue, and tobacco stalks) were cofired at 30 wt % with a U.S. sub-bituminous coal (Powder River Basin Coal) in a laboratory-scale fluidized bed combustor. A cyclone, followed by a quartz filter, was used for fly ash removal during tests. The temperatures of the cyclone and filter were controlled at 250 and 150 degrees C, respectively...

CO2 capture and storage (CCS) is receiving considerable attention as a potential greenhouse gas (GHG) mitigation option for fossil fuel power plants. Cost and performance estimates for CCS are critical factors in energy and policy analysis. CCS cost studies necessarily employ a host of technical and economic assumptions that can dramatically affect results. Thus, particular studies often are of...

Activated carbon can generally be made from carbon-containing materials such as coal. The activation in activated synthesis has different mechanisms and characteristics. objective of this study was to analyze the quality characterization bituminous coal using a fluoride (HF) activator. research method carried out starting sample preparation stage, chemical physical carbonization stage testing c...

A 3-dimensional coal structural model for the Argonne Premium Coal Pocahontas No. 3 has been generated. The model was constructed based on the wealth of structural information available in the literature with the enhancement that the structural diversity within the structure was represented implicitly (for the first time) based on image analysis of HRTEM in combination with LDMS data. The compl...

The long-term stability of Hg in coal combustion by-products (CCBs) was evaluated at ambient and near-ambient temperatures. Six CCB samples with atypically high levels of total Hg were selected for study assuming a greater potential for release of measurable amounts of Hg vapor. The samples selected included two fly ash samples from U.S. eastern bituminous coal, two fly ash samples from South A...

Abstract. Coal has certain physical and chemical properties, from these properties coal can be used as a parameter to determine classification based on rank. Balang Island is coal-bearing formation in the Kutai Basin. To depositional environment, samples were taken. From sample, characteristics such water content, volatile matter, calorific value, maceral mineral composition produced. character...

BACKGROUND It has been suggested that health related job selection is a major cause of the healthy worker effect, and may result in inaccurate estimates of health risks of exposures in the working environment. Improved understanding of self selection, including the role of airway hyperresponsiveness, should improve accuracy in estimating occupational risks. METHODS We evaluated symptoms of th...

Coal is one of the largest sources of energy production in the world accounting in 2006 for about 25% of the world’s primary energy supply, that amounts to almost with a worldwide consumption of 3,090 million tons of oil equivalent. Fly ash (FA), is a residue of coal combustion consisted of amorphous ferro-alumino silicate minerals with a matrix very similar to soil. Its elemental composition i...

This research evaluated the hydrocarbon emission characteristics during pyrolysis of four carbonaceous additives that can be used in green sand foundries. These included a highly volatile bituminous coal, anthracite, lignite and cellulose. The samples were flash pyrolyzed in a Curie-point pyrolyzer at 920 C with a heating rate of about 3000 C/sec. This simulated the fast heating conditions that...